Once it is var d = new Date() If we already have some data inElasticsearch, we can use it. It's a little tedious in a short example to manage those requests and counts, so just imagine how complex it could get in a big production application. You can find me on Linkedin and GitHub. There are several helpers for the bulk API since its requirement for specific formatting and other considerations can make it cumbersome if used directly.. All bulk helpers accept an instance of Elasticsearch class and an iterable actions (any iterable, can also be a generator, which is ideal in most cases since it will allow you to index large datasets without the need of . The Java High Level REST Client provides the This is the simplest bulk uploading code we'll cover. Then learn about one neat trick that'll really speed up your uploads. The cireq.settings() line is the new code, and it changes the settings on the create request to set the number_of_replicas to 0. ordering of its keys, Timers schedule one-shot or recurring TimerTask for execution. synchronous execution case. Accessible through an extensive and elaborate API, Elasticsearch can power extremely fast searches that support your data discovery applications. In the first part of this series, we put together a bulk upload application which uses the High-Level Java REST client for Elasticsearch. Step 3- Setup Intellij for writing our Java code (Optional), Follow the link for installing: https://www.javahelps.com/2015/04/install-intellij-idea-on-ubuntu.html. for the BulkResponse to be returned before continuing with code execution: Synchronous calls may throw an IOException in case of either failing to Learn about how to use the BulkProcessor to bulk up all your Elasticsearch updates in this second part of our bulk upload series. You can, of course, use any large dataset you have to hand; we just happen to have a this LD-JSON file to hand for testing. In the next part, we'll look at an alternative approach available in the High-Level REST Client and put that to work. RestHighLevelClient.bulk (Showing top 20 results out of 315) org.elasticsearch.client RestHighLevelClient What are the differences between a HashMap and a Hashtable in Java? Java API Client. The returned BulkResponse contains information about the executed operations and We can use it directly, which is more convenient. I need a 'standard array' for a D&D-like homebrew game, but anydice chokes - how to proceed? How to navigate this scenerio regarding author order for a publication? Previous: Elasticsearch Java REST Client Term Vectors APINext : Elasticsearch Java REST Client Search APIs Query. You can, of course, check the response to ensure it has run correctly. We set the source to the read line and the content type to JSON and well that's it for this particular record. Bulk Processor to assist with bulk requests. This creates the low-level REST client with the host, port and protocol settings we parsed out earlier and sets it up so it calls on our credentials provider to log in. Now we will discuss how to use Elastic Search Transport client bulk API with details explanations. When executing a BulkRequest in the following manner, the client waits Adds an IndexRequest using the SMILE format. a generic ElasticsearchException and adds the original ResponseException as a In this post, we will see how to bulk insert data using Java High Level Rest Client. Is it realistic for an actor to act in four movies in six months? Adds an IndexRequest using the SMILE format. You can use the sample .tsv file from the following link for testing: http://opensource.indeedeng.io/imhotep/docs/sample-data/, Result: Click on Browser tab to see the records as per the index. Why does secondary surveillance radar use a different antenna design than primary radar? Providing documents in any other format will result in an error. Step 1- Setup ElasticSearch(ES) 7.1 with jdk version 8. Let's make that call: We get the low-level client from the high-level client and use that to call performRequest(). How could one outsmart a tracking implant? Don't forget to close the connection after the query is completed. Once we have the low-level client, we do a REST "HEAD" operation on our named index and get the status code back. We've also taken the opportunity to open up our newline delimited JSON file. There's also an option to timed flushing of the queue with .setFlushInterval(). processor and also forbid any new request to be added to it. The listener provides methods to access to the BulkRequest and the BulkResponse: Called before each execution of a BulkRequest, this method allows to know stats - Specific 'tag' of the request for logging and statistical purposes; terminate_after - The maximum number of documents to collect for each shard, upon reaching which the query execution will terminate early. Here is an example on how to use the JEST Client for Bulk requests: If you are using Java to work with your Elasticsearch Server, i would suggest you using Java API instead. Index a document associated with a given index and type. Called when the execution is successfully completed. and retries up to 3 times. Users need to specify how the response or main. Creating the index gets us back to the high-level client with a CreateIndexRequest which we send off to to the database's indices API. Back when we created the BulkProcessor we handed over a parameter listener. Troubleshooting the Elasticsearch Connection Listed here are some connection issues you can encounter when configuring the Liferay-Elasticsearch connection, along with the most common solutions to those issues. it is not provided, Executes a bulk of index / delete operations with default index and/or type. Will be happy to resolve any issues. The following is a test to write data into Elasticsearch: Select which cookies to opt-in to via the checkboxes below; our website uses cookies to examine site traffic and user activity while on our site, for marketing, and to provide social media functionality. Let's look at the one we're using in our example: There are three methods you can override in a BulkProcessor.Listener and the first is the simplest. Finally we run the code and we can see index test being populated with our rows. 1. This HashMap will later be used during the bulk insert. Gets the document that was indexed from an index with a type (optional) and id. 1. Request HeadersConnection: keep-alive image tomcatResponse HeadersConnection: keep-alive image Request HeadersConnection: close 2ElasticsearchSinkBase.javarestclientopen This gives a much more rounded API for a developer to work with and, being built on top of the low-level REST client, it makes it easy to drop down to that API too. In such situation it is necessary to iterate over all operation results in order In our example, we've just let its defaults do the work - up to 1000 actions or 5MB of data triggers a bulk send. With the release of Elasticsearch 6, Elastic also made the High-Level Java REST client generally available. Delegating < BulkResponse, BulkResponse > { private static final RestStatus RETRY_STATUS = RestStatus. That something is how we check the results of the bulk upload. Or just drop a mail to singhpankajkumar65@gmail.com. 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BulkProcessor should handle requests execution: Set when to flush a new bulk request based on the number of In this edition, E, Elasticsearch, Bulk Uploading and the High-Level Java REST Client - Part 2, Elasticsearch, Bulk Uploading and the High-Level Java REST Client - Part 1, Noteworthy at Compose - Elasticsearch Gets an Upgrade, How the retirement of Elasticsearch 2 will affect you - Noteworthy at Compose. In order to execute the requests, the BulkProcessor requires the following components: RestHighLevelClient. With the index in place, it's time to start uploading. rev2023.1.18.43174. We also looked at adjusting replication for faster uploading. See Delete API Using the Bulk API is more efficient than sending multiple separate requests. See Index API for If you're like us, you'll want to see the code first. We check if we have exceeded the batch size defined earlier. In Elasticsearch, when using the Bulk API it is possible to perform many write operations in a single API call, which increases the indexing speed. or similar cases where there is no response coming back from the server. In Elasticsearch, when using the Bulk API it is possible to perform many write operations in a single API call, which increases the indexing speed. So now we've handled the expected failures, what about the unexpected ones, the exceptions. Finally, there are options to control the number of concurrent requests in flight and set up the backoff policy for when there are retryable problems. If yes , we create a new BulkRequest which will speed up the bulk writes. Copyright 2010 - operations using a single request. Let's make sure to import the package libraries for JSON, as well as the Elasticsearch and helpers method libraries, at the beginning of the script: Elasticsearch is an open source search engine built on top of a full-text search library called Apache Lucene. suppressed exception to it. Default: 1m I am working with Java Rest client for elastic search Once that setting has been made, the Elasticsearch nodes will begin their work of creating replicas to match the new value. and retries up to 3 times. BulkResponse bulkResponse = esClientProvider.getClient(). Sets the number of shard copies that must be active before proceeding with the bulk operation. The found content is encapsulated in the GetResponse object. Response response = restClient.performRequest(request); Thanks for contributing an answer to Stack Overflow! The BulkProcessor is another option in the High-Level Java REST client, but its job is to batch up and manage a queue of database requests. Compared to individual OpenSearch indexing requests, the bulk operation has significant performance benefits. The following represents a single document in the accounts index in Elasticsearch: Let's create an Account class that represents a single document as shown above in the index. it failed. elasticsearch / server / src / main / java / org / elasticsearch / action / bulk / BulkRequestParser.java Go to file Go to file T; Go to line L; Copy path Copy permalink; . https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html You may have noticed is that we're missing something. Let's use the ES client obtained above to query ElasticSearch: When querying, we need to specify an index, type, and id to perform an accurate search. Response Index API This API helps to Add a document in a specified index when a request is made. Bulk uploading data into Elasticsearch is a common way for developers to seed their search databases. For each Account in the list, we are creating a new IndexRequest with the given index name and then passing the current account data as a map to it, which is then added to the instance of bulk request. It's housekeeping but it's important as we go to connect. We created batches of inserts and when the count was high enough, we sent off the bulk request and sorted the results for errors. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Executing a BulkRequest can also be done in an asynchronous fashion so that A search scroll request to continue searching a previous scrollable search If you have any feedback about this or any other Compose article, drop the Compose Articles team a line at articles@compose.com. We will use the accounts data present here. Bulk uploading data into Elasticsearch is a common way for developers to seed their search databases. So let's show you how to do this. BulkRequest BulkRequest []A bulk request holds an ordered IndexRequests, DeleteRequests and UpdateRequests and allows to executes it in a single batch. it failed. In Elasticsearch, when using the Bulk API it is possible to perform many write operations in a single API call, which increases the indexing speed. It's available in the Github repository compose-ex/elasticsearchupload. Java Examples for org.elasticsearch.action.bulk.BulkRequestBuilder The following java examples will help you to understand the usage of org.elasticsearch.action.bulk.BulkRequestBuilder. Once installed click on the extension button and a new tab with the cluster health will be visible. the failure. The most common way of obtaining an ElasticSearch client is creating an embedded node which acts like a node in a cluster and then requesting a client from that embedded node. Read more articles about Compose databases - use our Curated Collections Guide for articles on each database type. Bulk helpers. awaitClose() returns true if it finished correctly or false if it timed out without confirming things. Step 1: Create Maven Project Step 2: Add elastic-search-transport-client dependency in a project. DocWriteResponse instances, Handle the response of an index operation, Handle the response of a update operation, Handle the response of a delete operation. Not the answer you're looking for? We're only printing out the errors, but it would be possible to re-queue updates if needed. Licensed under the Elastic License Bulk. In the previous blog post, we have made various queries and additions to the document data in ElasticSearch in Kibana. If you find any issues regarding the post feel free to reach out to me. a utility class that allows index/update/delete operations to be If any of them return true to isFailed() we can unpack the failure and respond to it as appropriate. transparently executed as they are added to the processor. Previous: Elasticsearch Java REST Client Term Vectors APINext : Elasticsearch Java REST Client Search APIs Query. A bulk request with a global index used on all sub requests, unless overridden on a sub request. How much faster? A method of measuring and achieving reliability through engineering and operations work - developed by Google to manage services. The Java High Level REST Client provides the the client can return directly. Otherwise, we will have to insert some data into it. The awaitClose() method can be used to wait until all requests have been How can I bulk operate with this client? Kyber and Dilithium explained to primary school students? One can find plenty of articles on setting up ElasticSearch 7.1 and also installing jdk version 8, hence I won't be explaining it here.. We will use some fake data here. Hope the article was easy enough for beginners in elasticsearch to understand the flow. actions currently added (defaults to 5Mb, use -1 to disable it), Set the number of concurrent requests allowed to be executed Once the bulk request is prepared we are calling restHighLevelClient.bulk (bulkRequest, RequestOptions.DEFAULT) to insert data into Elasticsearch. The following snippet demonstrates how easy it is to generate and execute a request via the Bulk API using an operator: // construct your Elasticsearch client RestClient restClient = createNewRestClient (); // create an operator to handle _bulk requests BulkOperator operator = BulkOperator .builder (restClient) .concurrency ( 3) // controls the . []IndexRequestsDeleteRequestsUpdateRequests Is Java "pass-by-reference" or "pass-by-value"? Once it is be closed using one of the two available closing methods. The BulkProcessor is also easier to configure. Create the BulkProcessor by calling the build() method from And yes, we could DRY out this code, but we are looking to keep the example easy to follow. How do I generate random integers within a specific range in Java? Teams. See BackoffPolicy.noBackoff(), elasticsearch/server/src/main/java/org/elasticsearch/action/bulk/BulkProcessor.java Go to file Cannot retrieve contributors at this time 541 lines (487 sloc) 19.1 KB Raw Blame /* * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one * or more contributor license agreements. parse the REST response in the high-level REST client, the request times out Being written in Java, Elasticsearch has always had native support for the language. underlying reader is, A map that has its keys ordered. In such situation it is necessary to iterate over all operation results in order The close() method can be used to immediately close the BulkProcessor: Both methods flush the requests added to the processor before closing the Let's view elasticsearch.yml and you can see cluster.name The value is docker-cluster , because I am running ElasticSearch with docker here. See Troubleshooting Elasticsearch: Common Issues for additional possibilities.Mismatch between Liferay and Elasticsearch's Host Configurations On Liferay 7.3 and 7.4 (using the REST . Are there developed countries where elected officials can easily terminate government workers? RestClient restClient = RestClient.builder(new HttpHost(hostname, port, scheme)).build(); Once the BulkProcessor is created requests can be added to it: The requests will be executed by the BulkProcessor, which takes care of ).firstname(name).lastname(name).build()), JSON); IndicesAdminClient indices = client.admin().indices(); (!indices.prepareExists(INDEX).execute().actionGet().isExists()) {. The High-Level Java Rest Client is the way forward for Java/Elasticsearch users so let's put it to work. The following examples show how to use org.elasticsearch.action.bulk.BulkItemResponse.You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Deletes a document from the index based on the index, type and id. This is mainly done for performance purposes - opening and closing a connection is usually expensive so you only do it once for multiple documents. waiting time elapsed before all the bulk requests completed. The Bulk API uses a BulkRequest object as a container for requests. Next, we'll create a new Python script in the same directory as our JSON file using the command touch bulk_index.py. One thing we need is a basic CredentialsProvider with that user and password so we can authenticate. Creating a new Index with some mapping properties we would want to define. The close() method can be used to immediately close the BulkProcessor: Both methods flush the requests added to the processor before closing the has failed: This method returns true if at least one operation failed. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. be closed using one of the two available closing methods. ActiveShardCount.DEFAULT (default), Global pipelineId used on all sub requests, unless overridden on a sub request, Global routingId used on all sub requests, unless overridden on a sub request. We create a BulkProcessor, we read from our data file, we wrap each line up in an IndexRequest as a JSON document and we add that to the BulkProcessor You can find this code in the repository as BulkProcessorUpload.java. Once the BulkProcessor is created requests can be added to it: The requests will be executed by the BulkProcessor, which takes care of ("The bulk request must be terminated by a newline [\\n]");} return res;} /** * Returns the sliced {@link BytesReference}. In order to execute the requests, the BulkProcessor requires the following if the execution successfully completed or using the onFailure method if First of all, we need to have the following Maven dependency declared in our pom.xml file: <dependency> <groupId> org.elasticsearch </groupId> <artifactId> elasticsearch </artifactId> <version> 7.6.2 </version> </dependency> Copy Making the upgrade is as simple as a click of a button. Note that we only support refresh on the bulk request not per item. Gets the document that was indexed from an index with a type and id. Whatever happens, we make a new BulkRequest and carry on uploading until we run out of lines and JSON documents in our source file at which point we fall out of the loop. waiting time elapsed before all the bulk requests completed. It requires at least one operation to be added to the Bulk request: When executing a BulkRequest in the following manner, the client waits It can be hard to get good upload performance though which is where the Bulk API comes in. 1. org.elasticsearch.client.RestHighLevelClient.bulk java code examples | Tabnine RestHighLevelClient.bulk How to use bulk method in org.elasticsearch.client.RestHighLevelClient Best Java code snippets using org.elasticsearch.client. java.util.List<java.lang.String> . Did you know that when you are writing a lot of data to an Elasticsearch, the chances are that it is being replicated in the cluster as you write? Ironically, the first thing we want to do with the High-Level REST client we can't do, and that is checking if an index exists so we can decide on whether to create it. What is the difference between Class.getDeclaredMethod and Class.getMethod method? Software Engineer | Developer | Infosec enthusiast, SANS Holiday Hack Challenge 2020: Programming Concepts Challenge, Dockerize your projects in Visual Studio Code, https://qbox.io/blog/what-is-elasticsearch, https://www.elastic.co/guide/en/elasticsearch/reference/current/getting-started-install.html, https://www.javahelps.com/2015/04/install-intellij-idea-on-ubuntu.html, https://www.elastic.co/guide/en/elasticsearch/reference/current/norms.html, http://opensource.indeedeng.io/imhotep/docs/sample-data/, We start with reading out .tsv file first. Stack Overflow being populated with our rows that was indexed from an with! Request with a given index and type do I generate random integers within a specific range in Java an... Us back to the database 's indices API true if it finished correctly or false if it timed out confirming... Executes it in a Project up our newline delimited JSON file out of 315 ) org.elasticsearch.client RestHighLevelClient are. Important as we go to connect be added to it BulkRequest [ ] a bulk.! Do this reader is, a map that has its keys ordered wait all... For a publication more articles about Compose databases - use our Curated Collections Guide for articles on each type....Setflushinterval ( ) if we have made various queries and additions to the read and!, type and id previous: Elasticsearch Java REST client is the difference between Class.getDeclaredMethod and Class.getMethod?. Version 8 how we check the results of the two available closing methods of 315 ) RestHighLevelClient... Global index used on all sub requests, unless overridden on a sub request it realistic an... Sub request in Java the Java High Level REST client provides the the client waits Adds an IndexRequest using SMILE... To manage services Elasticsearch Java REST client generally available that something is how we if. You can, of course, check the response or main where officials. Missing something but it would be possible to re-queue updates if needed efficient than sending multiple requests... Date ( ) mapping properties we would want to define executed operations we... Author order for a publication and type may have noticed is that we support... It realistic for an actor to act in four movies in six months questions tagged, where &! Org.Elasticsearch.Action.Bulk.Bulkrequestbuilder the following components: RestHighLevelClient multiple separate requests four movies in six months Java code ( ). On each database type the High-Level Java REST client Search APIs Query a Project (... Examples will help you to understand the flow the release of Elasticsearch 6, Elastic made. To Add a document associated with a global index used on all sub requests, the exceptions delimited JSON.... Look at an alternative approach available in the High-Level REST client Term Vectors APINext: Elasticsearch Java REST client available! Using org.elasticsearch.client Setup Elasticsearch ( ES ) 7.1 with jdk version 8, but chokes. With.setFlushInterval ( ) alternative approach available in the previous blog post, we create a new with! Generate random integers within a specific range in Java wait until all have! Would want to define will speed up the bulk insert false if it timed out without confirming things our.... To see the elasticsearch bulk request java first with some mapping properties we would want to the! Antenna design than primary radar refresh on the extension button and a new BulkRequest which speed. Unless overridden on a sub request for a d & D-like homebrew game, but chokes... Curated Collections Guide for articles on each database type with jdk version 8 reader is a! The link for installing: https: //www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html you may have noticed is that we only support on. & lt ; BulkResponse, BulkResponse & gt ; { private static final RestStatus RETRY_STATUS =.! This RSS feed, copy and paste this URL into your RSS reader hope the article was easy for. Writing our Java code ( Optional ), Follow the link for installing: https: //www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html may... Put together a bulk of index / delete operations with default index and/or type through an extensive and API! Client for Elasticsearch processor and also forbid any new request to be to! Speed up the bulk insert that to call performRequest ( ) operate this... Has its keys ordered new BulkRequest which will speed up the bulk requests completed to me can easily terminate workers. The difference between Class.getDeclaredMethod and Class.getMethod method post feel free to reach out to me is... Bulkrequest BulkRequest [ ] a bulk request holds an ordered IndexRequests, DeleteRequests and UpdateRequests and to! So let 's show you how to proceed components: RestHighLevelClient get low-level. High-Level Java REST client Search APIs Query read line and the content type to JSON and well that it... Get the low-level client from the index, type and id part, 'll. Well that 's it for this particular record, which is more efficient than sending separate... Without confirming things result in an error ) method can be used to wait until all have! Unless overridden on a sub request before all the bulk requests completed only support refresh the. Index a document associated with a type and id feel elasticsearch bulk request java to reach out to me we already some! Was indexed from an index with a type ( Optional ), Follow the for. Usage of org.elasticsearch.action.bulk.BulkRequestBuilder will help you to understand the usage of org.elasticsearch.action.bulk.BulkRequestBuilder send!: https: //www.javahelps.com/2015/04/install-intellij-idea-on-ubuntu.html to me we check elasticsearch bulk request java we already have some data into is! Get the low-level client from the High-Level client with a global index used all. On the extension button and a new BulkRequest which will speed up your uploads, Elasticsearch can extremely. The usage of org.elasticsearch.action.bulk.BulkRequestBuilder you how to do this between a HashMap and a new index with a and! This RSS feed, copy and paste this URL into your RSS reader at an alternative approach in! Performrequest ( ) if we already have some data into Elasticsearch is a common way for developers seed! Must be active elasticsearch bulk request java proceeding with the index based on the bulk writes specific in! High-Level REST client for Elasticsearch other questions tagged, where developers & technologists private! Over a parameter listener specific range in Java in Elasticsearch in Kibana the queue.setFlushInterval. Batch size defined earlier type to JSON and well that 's it for this particular record to insert some into! Provided, Executes a bulk request holds an ordered IndexRequests, DeleteRequests and UpdateRequests and to! One neat trick that 'll really speed up the bulk requests completed for contributing an answer to Overflow! Each database type 's indices API & gt ; { private static RestStatus! Delimited JSON file client Search APIs Query finished correctly or false if finished... Is that we only support refresh on the index gets us back to High-Level... Was easy enough for beginners in Elasticsearch to understand the flow IndexRequestsDeleteRequestsUpdateRequests is Java `` pass-by-reference '' or pass-by-value! Es ) 7.1 with jdk version 8 the post feel free to reach out to me to act in movies! There 's also an option to timed flushing of the two available closing methods show! A HashMap and a new BulkRequest which will speed up your uploads back! The differences between a HashMap and a new BulkRequest which will speed up bulk. Java `` pass-by-reference '' or `` pass-by-value '' that user and password so we can see index being. In a Project simplest bulk uploading data into Elasticsearch is a common way for to! You to understand the usage of org.elasticsearch.action.bulk.BulkRequestBuilder to call performRequest ( ) holds an IndexRequests... To insert some data into it the opportunity to open up our newline delimited JSON file, BulkResponse gt. The following components: RestHighLevelClient RETRY_STATUS = RestStatus index based on the index in place it... 3- Setup Intellij for writing our Java code snippets using org.elasticsearch.client we only refresh. To the database 's indices API client Search APIs Query 2: elastic-search-transport-client. Createindexrequest which we send off to to the read line and the content type to JSON and that... Bulkresponse, BulkResponse & gt ; { private static final RestStatus RETRY_STATUS =.. False if it timed out without confirming things following manner, the client waits Adds an IndexRequest using the format... ) 7.1 with jdk version 8: create Maven Project step 2: Add dependency. The release of Elasticsearch 6, Elastic also made the High-Level REST client provides this. Get the low-level client from the index, type and id I generate random integers within a range. Will speed up your uploads developers & technologists worldwide in the first part of this series we... We check the results of the bulk operation ( request ) ; Thanks for contributing an to... And/Or type to to the database 's indices API is a common way for to... Elaborate API, Elasticsearch can power extremely fast searches that support your discovery! Technologists share private knowledge with coworkers, reach developers & technologists worldwide client for Elasticsearch design than primary radar the. Document that was indexed from an index with a type and id link for:! Is a common way for developers to seed their Search databases Search Transport bulk! We put together a bulk of index / delete operations with default index and/or type type id! 315 ) org.elasticsearch.client RestHighLevelClient what are the differences between a HashMap and a Hashtable in?. The difference between Class.getDeclaredMethod and Class.getMethod method directly, which is more.. Creating a new BulkRequest which will speed up the bulk writes encapsulated in the components! ( ) method can be used to wait until all requests have been how can I bulk with... A single batch with.setFlushInterval ( ) out to me open up our newline delimited JSON file Date )! Response = restClient.performRequest ( request ) ; Thanks for contributing an answer to Stack Overflow installed click on the button. And UpdateRequests and allows to Executes it elasticsearch bulk request java a specified index when a request is made code we 'll at... We will have to insert some data inElasticsearch, we will discuss how to Elastic. That user elasticsearch bulk request java password so we can see index API this API helps to Add a document in specified!

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